{"cve":{"cve_id":"CVE-2021-24029","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.01186,"epss_percentile":0.65534,"epss_as_of":"2026-08-26","description":"A packet of death scenario is possible in mvfst via a specially crafted message during a QUIC session, which causes a crash via a failed assertion. Per QUIC specification, this particular message should be treated as a connection error. This issue affects mvfst versions prior to commit a67083ff4b8dcbb7ee2839da6338032030d712b0 and proxygen versions prior to v2021.03.15.00.","published_at":"2021-03-15T21:15:16Z","last_modified_at":null,"cvss_v3_score":null,"cvss_v3_vector":null,"cvss_v3_severity":null,"cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":null,"ssvc_automatable":null,"ssvc_technical_impact":null,"cwes":["CWE-617"],"nvd_references":["https://github.com/facebookincubator/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0","https://www.facebook.com/security/advisories/cve-2021-24029"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-28T23:15:08.591437Z"},"effective_severity":null,"badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":null,"metrics":[]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"facebook","vendor_name":"Facebook","product_slug":"mvfst","product_name":"mvfst","version_start":"a67083ff4b8dcbb7ee2839da6338032030d712b0","version_start_inclusive":true,"version_end":"unspecified","version_end_inclusive":false,"cpe23_uri":"cve5:facebook:mvfst:a67083ff4b8dcbb7ee2839da6338032030d712b0:unspecified"},{"vendor_slug":"facebook","vendor_name":"Facebook","product_slug":"mvfst","product_name":"mvfst","version_start":"unspecified","version_start_inclusive":true,"version_end":"a67083ff4b8dcbb7ee2839da6338032030d712b0","version_end_inclusive":false,"cpe23_uri":"cve5:facebook:mvfst:unspecified:a67083ff4b8dcbb7ee2839da6338032030d712b0"},{"vendor_slug":"facebook","vendor_name":"Facebook","product_slug":"proxygen","product_name":"proxygen","version_start":"v2021.03.15.00","version_start_inclusive":true,"version_end":"unspecified","version_end_inclusive":false,"cpe23_uri":"cve5:facebook:proxygen:v2021.03.15.00:unspecified"},{"vendor_slug":"facebook","vendor_name":"Facebook","product_slug":"proxygen","product_name":"proxygen","version_start":"unspecified","version_start_inclusive":true,"version_end":"v2021.03.15.00","version_end_inclusive":false,"cpe23_uri":"cve5:facebook:proxygen:unspecified:v2021.03.15.00"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/facebookincubator/mvfst/commit/a67083ff4b8dcbb7ee2839da6338032030d712b0","source_type":"PATCH","tags":["patch"]},{"url":"https://www.facebook.com/security/advisories/cve-2021-24029","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2021-03-15T21:15:16Z","label":"CVE published","source":null}]}